Reinforced truss for concrete.



No. 811,927. PATENTED FEB. 6, 19GB. E. B. JRVIS.. REINPGRGED TRUSS FOR CONCRETE.

APPLICATION FILED DBU. 15. 1904.

UNITED STATES PATENT OFFICE.

EDGAR Bl-AUMONT .lARVl-, TRNTO, CANADA.

REINFOROED TRUSS FOR CONCRETE.

Specification of Letters Patent.

Patented Feb. 6, 1908 Application filed December 15, 1904'. Serial No. 236,987.

l Jsnvrs, of the oity of 'iorontofiu the` county -througl'i the openings provided with spurs c c. he bar c is siepe rated from the bei' b by the separating-blocks 6 6. A

of York, in the Province of Ontario, Canada, have invented certain new end useful .lmproveniente in Reinforoing-'Irussos for ConY crete, o'f' which the following is the specifica.- tion,

Mv invention relates to improvements in rein sireingtrnsses for concrete; and the object of the invention is to devise e truss of this class which will be strong, eilieient, and ilieaply made; and it consists, essentially, of an Lbeam provided with n series of o en ings and bers extending underneath the be-oni ond bevingobliquely-erren ed ends extending upwardly and outwer ly et each end beyond the upper side of the I-benin, the seid bars being arranged adjacent to euch other with the shortest in tbe center next the I-beani and the truss be;

with the lighter ber ing otherwise arranged and constructed in detail, as hereinafter more particularly expleined.

Figure l is e perspective view showin my improved truss. Fig. i is e longitudine seetion ofthe truss. Fig. 3 is a cross-section.

In the drawings like Characters of referenceJ indicate eorrespondiirr parte in cach figure.

A istlie I-beain, which in the present instance I show with a series of openings 2 2, 3 3, and 4 4. Y Y f o is the central ber, which is provided with obliquelysheped ends e o', which entend through the openinvs 2 2.

It will be noticed that the ends a extend in e direction outwardly toward the end of the I-bern and are preferably provided with spurs a2.

b is the bar immediately underneath the ber o, such ber being longer then the ber a und having the obliquely-sbaped ends b" b, extending through the openings 3 3 and provided with spurs if b2.

5 5 are"se draining-blocks separating the bar b from t e ber o.

c is e third bar located underneath thur bar b and having the obliquely-arranged en is c c extending through the o enings 4 4 and Such ay truss ves I describe w hen embedded in cement is extremely strong, and tho obi lique portions of the bars, it will be seen, take the Vshearing strain.

Although i show three bars a, b, and c it will ol" course be understood that env nunk. bei' of bers may be provided depen ing onv the length of the truss and that Corresponding openings will be inode in theY truss to suit the number of bars.

Although I show the beam A es 2in1-benin,

it will be understood that it may he of onyoross-sertionol forni, suoli es a Channel-benin.

i preferably make each of the bars, including the oblique portions, gradually greater in crosslsevtionnl eren, storting et the center and increasing in weight as they approach the end of tln` truss, thereby saving niotnl in the truss. 1

It Will of @ourse be understood that the shearing strain et tbe Center is less than et the ends, and for this reason I ein enabled to predire-e e strong and vet economical truss.

It will be noticed that the ends of eac-h of the oblique portions of the bers-ere bent to forni spurs and such sirs, as will be readily understood, forni an e cient means for preventing the oblique ortions drawin throu h the cerner t. It wil also be notice that t e bars a, b, 11nd c are held apart b blocks and that openings 7 are provided etween the l oblique en is of the bar underneath the bearn,

and I arriin e my truss esEeoieli-y in this manner, foi` t e reason that t e cement when oured in will fill the interstiees between the Elooks and the ends of the bers and thereby cementing the diiierent members together and inekinge unitary truss.

Another silventege of my invention is that for convenience of transportation all the bers ma. be shipped in straight form and bent an placed 1n position in thc beam Where the Work is going on. A

What I eleim as my invention is 1. In a reinforcing-truss for concrete, the combination with the beam having e plurality of o enings, of a. bar extending under neatli t ie beam and upwardl and outwordly through the openings an having 'obliqueiy-errengeftl ends oppositelj,T inclined to- Werd the ends er the neem as and for the pur- Bose s eeiiied.

2,. n e reinforcing-truss for concrete, the combination with the beam having a plurality of openings, ofl ber extending ronstrurtion of the Y rpurpose specified.

- bars `extending underneatligt heath the beam and upwardl and outwardly through the openings an having ob- Y liquely-arranged ends oppositely inclined toward the ends of the beam and-provided with spurs as and for the purpose specified.

3. In a reinforcing-truss for concrete, the combination with the I-beam having a pluralit of openings, of a bar extending underneat the beam and upwardl and out wardly through the openings an -havingfobliquely-arranged ends oppositely inclined toward the ends of the beam as and for the pur-l pose specilied. y

4. In a reinforcing-truss for concretel vthe combination: with-the `beam having a plurality of o ening'syof a! 'lurali-ty of bars extending un erneath the eam and upwardly and outwardly through the openings theshortest being located in-'the center, eac of the bars having obliquelyarran ed Vends extending through the openings anoppositely incl ine towardthe ends of-the beam asand for Ithe 5. In a reinorcl -tnuss for concrete., the combination withglthe beam having a p'liralityof o eningsyoffa; lurality of bars extendingfun erneathrtheg outwardly through the openings the shortest being located in the center, eac of the bars having obliquely-arranged ends extendn through-the openingsfandoppositely in eline toward the ends of thegbeaniandcsep aratingblocks located bet'qtveemthe.' rtions of-the ligbeam as and for tlyepurposespecied.

6. '1 a reinorcingftljlss for concrete, the A 4the beam, andendsqf,the bars as eam and upwardly and combination with the main bar or beam, of supplemental bars suitably held thereto and provided with obliquelyarranged ends, the

said bars increasing in vcross-sectional area from the center outwardly as and for the puri pose s ecified.

n a reinforcing-truss for concrete, the combination with the beam having a plurality 'of o enings, of a lurality of bars extending un erneath the lieam and upwardly and outwardly through the openings the shortest being located in die center, each .of the bars having obliquelyarran ed ends extendin through the openings and oppositely inclined toward the ends ofthe beam and separatingblocks locatedbetween the portions of the bars' extending underneath the beam, the said separating-blocks `and ends of the bars being so arranged as to provide o enngs between the bars themselves and t e bars and and for the purposel specified.

8.' In a reinforcing-truss for concrete, the combination with theibeam having a plurality of lo enings, of a bar extending underneath -t e beamand upwardl and out wardly through the openings an having obliquelyaifranged ends oppositely inclined toward the ends of the beam andheld ini lace by the contact-of theupper and lower si es of the oblquely-sliaped ends on the edgesof the openings asfand for the ose specied.

' 1' E; BEArN T JARVIS.

Witnesses:

B. BOYD,

t E B. MATTHEWS. 

